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Ignition Check
Is fan running?
Is sparking present at
the electrodes?
Faulty PCB
Replace
Connect ignition leads
securely
Are leads breaking
down?
Ignition coil faulty
replace PCB
Replace leads
Does burner continue?
Does gas pressure
modulate?
Ignition OK
Faulty PCB
Replace
Is flame sense
electrode in flame?
Is lead secure
both ends?
Secure lead
Ensure flame sense
electrode in flame at
minimum burner
pressure
Are ignition leads
connected both
ends securely?
Does sparking occur?
Does ignition occur?
YES
YES
YES
YES
YES
HARNESS OK
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
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CHECK G
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CHECK E
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CHECK M
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CHECK I
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CHECK N
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CHECK L